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You've had good gains so far, are you still gaining?
Try mixing jelqs and intense girth exercises, for example horse squeezes, this means you could do 5 min jelqs, 2 Horse squeezes and repeat that a few times, you should find that jelqs feel more efficient, and horse squeezes are good for girth.
There's plenty of exercises out there, but I think you could definitely look into more advanced stuff rather than doing a hour of jelqs..
You could also jelq at a higher erection level.